A while ago I converted my baby's electric car into an rc overpowered kids car. After a few weeks of testing I finally got it going very well. I run it on 3 different voltages. 11.1v - 14.4v - 22v.

To much of my wife's distress I got to a skate park today.
In the pic I am just holding it straight as it is 1 wheel drive (putting a hpi baja diff in this week).

On 11.1v good for normal walking, 14.4 fast walk and wheelies as below, 22v is just scary ( to much for him atm ). It is almost 100% rc as the steering servo is fixed although he can still use the foot throttle which does catch me out.

Also good for walking the dog. I can see plenty hrs of fun to be had with this especially when he is old enough for 22volts